Friction shock-absorbing mechanism



Dec. 25, 1928. 5 1,696,350

H. FUCHS FRICTION SHOCK ABSORBING MECHANISM Filed July 23, 1927 2 Sheets-Sheet l Dec. 25, 1928.

H. FUCHS FRICTION SHOCK ABSORBING MECHANISM Filed Jul%25, 1927 2 Sheets-Sheet 2' Invenfnr Henry Fiwfia A'T' if v I I I 1,696,350

n e FF?! EZENB" muons, F ion eAGo, ILLINOIS, essienon rowhn, mitten, nies.,oimeisieeeo; JILLINQISsACORPORA ION OFDELAVIAEE. l l i e FQIC ION snoo imssonjgme Ii/menses Application filed gnn 23 of 'ueed design anclfhighcepacity, having ineensi finer; v 2i iront end elevetionel View of the-sh ock largefrictionei al ens provided by aficiction shell and post oooperating'with a wedgefi'ictioninezins, whereinthe 'fi ietion means is held out of contact with the inactive wells of the shell to prevent Wear of illlB lZlhtBT, the fl'iCt-ltflllllGlllS being so clesigneil as'to co ne pensate 'foi' unavoidable inaccuracies"fin .ina-nuiaetui'e of; the members of the friction Another object-of the invention is to provide a friction shook absorbing mechanism 01 me character inclieated, including 1; casring having friction sorfaces and Central friction post also provided with friction surfaces together Withvv edge'friction means cooperating with the friction surfaces of the post and casing,'the ffictionn 'eans including a plnmh'tyof elements hav ng wedg ng en gegeinent with each other, wherein the. eoopei-st ng ifriiot on surfae'esof the fflCUGn relative movement of the partsjtoLafdireetion lengthwise of themeehanism toin aintein the friction means out of contaet with the inactive walls of the casing to prevent wear of sand walls, and whereinthe cooperat ng {wedge faces of the "friction means; present e g r-iainliet surfacesso that the parts w llflacj cennnechite themselves for slight inztccum oios oi the interengaglng friction.surfaces, such as 236', unavoidable ancier the usual, fmanufactui'ing condit ons.

e Other objects oi-.t11e invention will more clearly appeal from the ClQSOI-lliuhlQIl fiIld a oleiinshereinaften following.

the drawings, fomninge partof this specifimtien Fi 'ure 1 is a horizontal, longitudinal sectional viewof a poi'tion of smilway draft rigging illustrating iny improve "in connectiontherewith. Figure 2 is ebsoi'bingniechenism proper. hjiguieejis a transverse; vertical sectional view;-;co respending substantially to the line of Figure {lie 2; longitudinel ven \Uionel view of the forwz rcl endlooi j th shock ebsor'bing meehenisin o espondiiig substzintielly to the Eigure 1. And Figu 'es 5 and 6 and :a friction shoe employed gm "s nsi ve. 207,365

are detail perspective views of 21 wedge block 7 "whicheie seoui'ecl front'stop lugs 11%11 and rear stop lugs 12+-12 [of well knownfori n.

The reguend portion of the draw baEr is 'indiceted by 13 to which "is operatively eon 'neete'cl e yoke I41 Theshock absorbing" meshenisinlprepel and a front inein followei' l5 efe'jdisposed within the yoke; e The yoke and theperts therewithin are suppoiited inr jzopeietive position a saddle pllate'16 detachably secnied to thecli a ft sills 10. r inipioved'shoekabsorbing mechanism proper comprises b 'oadly, a casing A; at pair of liners B B; twoweflge blo oks'c Cflwo fric t-ionshoes D-'-D aicent ml fr ction post E 5 twin/arranged spring, resist inee F-F; a spring folio .TeifG; and ii pii ll of retainer bolts QH H;

tizilly reetengulei:,, o:e1ik feasting having, longitud nally extending The easing is intthie ifo 'm of a substen wsyr,,oa n'nderf ravme; to the nner sides of speced'veytical side i neens post and casing interengage to liinitj wells l7 l7;- horizontally: disposed: long-L.

gtud inallfy'. extending spaced top bottom walls 18 18; a vertical ltllllSJG a rear end wallf19 The endywell l9 eoopei etes .J'vvith stop lugs 12 in inannei the usual? rear follow r. 'At the fo w rd end the side walls of the casing Arnie thickened, as 7 indicated ht" 20; the tl'iiekened portions 20 being eiit out centr ly t o; ii ovicle frontenci] 'eaiif abtitment ribs 21+2l, I sei ing n ezms forthe liners B: As most clearly shown' in Figure 2, the ffontpeiiof ribs 21' eieoentrally cutaway; between the top end bottom sides thereof as, indicated etr22 to perniiti insei tion of the spi ing lresiste ice ele inents 'F ,in'to the casing Ag h lZtftGl more clearly explained. Atthe'foiard end of the casing iAflthe' top enehbottoin wells '23-:23 which eoopere 18 thereof are provided inwandly ate with the friction post Bite:li nitlontwzird movement, t-hezfeoii} The: top and: bottem as bent-"1 iii) casino A.

ribs2l positively prevent lon I ment of the liners with respect to the casing e 2 f present flat abutment surfaces 25, which cooperate with the inner end of the post E to hold the same against movement inwardly of the casing A. In addition to serving as abutment means for the post E, the ribs 2st also serve to hold the twin springs l sepa-. rated and in proper position.

The liners B are secured to the opposite side walls of the casing A. The "two liners B are of similar design, each being in the form of a relatively thicl: substantially rectangular plate having a longitudinally disposed inner friction surface 26 of ii-shaped section, as most clearly shown in Figures 2 and 3. @n the outer side each liner B is cut away at the front and rear ends thereof to accommodate the retaining ribs 21 of the lVhen the liners B are in position as most clearly shown in Figure 1, the

gitudinal move- A to hold the same anchored to the casing. As illustrated in the present disclosure of the invention, the friction surfaces 26 of the opposed liners are parallel tothe longitudinal axis of the mechanism, but it will be evident that the same may be arranged so as to converge inwardly or the mechanism.

The pressure transmitting wedge blocks C are disposed at opposite sides of the mechanism and are of similar design, except as hereinafter pointed out. Each of the wedge blocks C is provided with a transverse flat front end face bearing directly on the inher side of the main follower 15. On the outer side each block C is provided with a longitudinally disposed friction surface 27 of V-shaped section so as to interfit with the corresponding friction. surface 26 of the liner B with which the wedge block coopcrates. At the inner end each block C is providedwith a wedge face, the wedge face of one of the blocks being designated by 28 l and that of the other block being designated by 29. As will be clear upon'reference to Figure 1, the wedge face 28 is disposed at'a keener angle with respect to the longitudinal axis of the mechanism than the wedge face The friction shoes D; which are also of similar design, except as hereinafter pointed out are disposed at opposite sides of the mechanism and cooperate with the wedge blocks C-C. Eachof the friction shoes is provided with a fiat rear end face adapted to cooperate with one ofthe twin arranged spring resistance elements'l On the outer side each shoe D provided with a wedge face cooperating with one of the wedge blocks C, the wedge face of the'shoe D which coopwitl'ithe wedge face 28 of one of the blocks G being de. nated by 30 and that of the other block which cooperates with the wedge face 29 heingz designated by 31. The

" wedge faces 30 and 29 are correspondingly shor-Jn in ends bearing on inwardly projecti;

0n the inner side each friction shoe D is pro videdwvith a longitudinally. disposed friction surface 32. The friction surfaces 32 are "c -shaped section as most clearly Figures 2 8 and When the parts are in their assembl d position the opposed friction surfaces 32 of the friction shoes dive o'e inwardly of the mechanism.

The fric n postll is in the form of a relatively heavy rectangular plate having. friction surfaces 3333 on the opposite sides thereof. The friction surfaces 33 are oft? shaped section and interiit with the friction surfaces 32 of. the friction shoes D. As clearly shown in Figure 1, the friction post or plate E istapered and the friction surfacestlil on the opposite sides thereof diverge inward y of the,mechanism. At the forward end the top and bottom edges of the friction post 1*] ar cut away as indicated at 3%, thereby arose ting "vertical abutment faces" 35 adapted to engage in back of the lugs 23 on the top and bottom walls of-the casing A. lhe main body portion ofthe post is of such a size as to accurately lit between the lugs and the abutment shoulders of the casing. The cooperating lugs 23 and posed at opposite sides of the mechanism,

each member including an inner spring and a relatively heavier outer coil spring. The rear ends of the outer coils of the two twin arranged spri elements bear directly on the end v ll 19 fl M a (lit1 e l" of; the spring follower G4 The inner coils of the two spring elements have heir rear I hollow bosses 36 formed integral with the end wall 19 of the casing. The forward ends of the inner coils of the springs bear directly on the inner endsof the friction shoes Dl), the spring follower Gbeing' recessed as indicated at 37 to freely accomi'nodate the front end portions of the inner coils of said spring resistance elements. l 7' The spring follower G is in the form of a substantially flat plate-like member corresponding in outline to the open end portion ofthe casing A, so that the same may be freely inserted through the open end of the casing when the liners B are removed. The front surface of the spring follower G bears directly on the inner ends of the liners B. thus limiting outwai movement of the spring follower; The central portion of sprii lower is tliiclzenedas most cleai shown in'Figure 1 so that the same will bear of these coils bear directly on the inner side I directly on the inner end of thefrictionpost when the ports are in their run release easing fiend serve toholcl the parts 311-. ehoreclr As will be seen-upon reference tol v faces the blocks lhe .tentlency "of the inneriooils or the springs to expend else wells or" the casing A by clisposi position. i 7

lhe nieehenismis held of uniform overall length and in assembled TGlMHGILby the two retainer bolts H. Theretainer holtsH as clezirly shown in Figures1, 2 and 3 are dis posed at OPPOSIJCG' s des of the mechanism and have their shanks extending throughlongituchnsl opeirngs provided in the wedge bloeksC and the frictionshoes D} Each wedge hlocli C lS-prV1d6CtW1tli erecessyet the outer end tllelBOffildEtPhBCllJO- itCCOflllhO- date the head of thecoi'responelingbolt,

The nuts of the holts'H are disposeclwith'in the "hollow bosses 36st the rear end o f the Figure/1 the bolt openings in tlie"it eelg'e hlo'cksenrl friction shoes ereof such a size as to phll'lllt a certaineinount of lateral displacement of the parts w-thout bin'clihg the bolts. In addition to-holding thewparts assenihlech the bolts also serve to maintain the spring resistance ele nents' F unclerlinh" tizil compression; inasmuch; as the central coils ofthe twin spring-resistance elements F are under initial CO IDPFGSSIODQfhG tend.- [en'oy of the some to expand W 1 wedge faces of the mechanisin'hy 'urgingthe friotionsshoes D outwardly"zigt instthewedge serves another PHFPOSQ,I1&1I1Q1Q fthzit or holding); the liners assembled'with the casing A by forcing the weclge blocks Ulsteflly' outwardly clue to the 'wecl'ging engagement between these blocks and f the friction shoes D. v

In assembling the mechanism the twin spring resistance eleinentsF are inserted 21 21. With the parts thus far assemblecl' it will he seen that/ the sprin flfollower' Gis 1 held "ageinst outward movement by engage inent of the liners B. I The friction post E is next placed in position by dlsposing the rnein body portion there between thelugs 23 and. the abutment siirfi-ces25 fof-Qthe rihs The frictlonshoes Df D an the wedge 'blocks.@-,-O ere-next plscecl info ie we ecured the anchoring ret nerhol Tlhe operation of my iniproveclshock eh- V, sorhinogmechanism assuming a. compress on stroke, is follows? The i'neiii follow-en 3 and the. casing A willhewinovecl relative i toward each other, thereby'forciiig the wedge vfriction shoes, a, wedgingfsetion willheiset Compression of the central coils only of the the central coils ofthe spring resistance eletheir outermost positio greatly facilitated bv the err'zing pair o poop tin I wedge blocks o tio'n shoes. in; :{lilflllilOD to i o blocks C inwercllyiof' thekcasing, Aelongithe firiction snrfaces oi the liners B. DuetO the keen ongl'e' weclging faces 28 and 30 of one setofcooperatingwetlge hloclzsantl A,

7!) up during the-oompression of the 1nech-- enisni-foroing ithe-i friction slices D into intimate contact -with the friction surfaces otthe'postE enclthe friction surfaces of the wedge blocks G into intimate: contact with the i ri'ction'surfeces of the liners B. As the eoinpression stroke progresses, the friction s ces D will. he forcecl iliWELICih of the friction surfecesof the posthl 'icsusing sec tence eln ients the; compression twin arranged ring res ltih-ii1gtl16 first part or: stroke: Asolearlypshown in Figure 1 ,the inner ends of the friction shoes Dai"e:inor-. inellya'spscecl iro n El1G"-f1'OTlh"fftCB oi Tithe spring follower G. Whenthe clearancebe o tween the friction shoes and tlie follower Gis taken up, the follower G will heiorcecl rciirwzirrlly in unison withithe friction shoes D, thus effecting compression of the-outer 9L! coils of the spring resistance elements 1* LlsOL ii hetlescriheci compression stroke of) the inechenisin continue either until the ZICtlll-ifi V "i force is reduce I' the-spring follower is limited in its ino vementflhyi engagement with the casing 1 A. Upon fen sgenient of the ezisingA by the follower- 1o, the semis-ting force trsjnsniitteclj ilire'ctlyfthrouigh the casing; A, the latter acting h s a solid column loacli'trzinsmitting niemher f0 prei entiindue compressionp ythe"main sp ng resistence'FN i i During release oi "the i mean the" actuating force is irechicecl,

i ism when the esipzin i .1 or, *r 'SIVS actionof the s1' ringres sta-nce elements ll Fbt'oresthe psrtswoiit erclly. During: first part of the releasing action, the s i p M follower G, frictionlshoes D and wedge blocks C will he carried outwardly substantially in'uniso'n until inoveinent oi "the springfollower G is positivelylimitecl by engagement withthe "inner entls of thej'lir ers 1B, wh ereupon the further expeiision to .L

blocksC.-. The relez isingv'setioniof the ineohein 111 is lease of the mechanism; these blunt we feces i jel'so's'erve another iunction ,clnrin coinoressio roke the t e e cooperating friction surfaces.

tion of the cooperating friction surfaces of the post and shoes. It will be evident that during the compression stroke of the mechanism, due to the diverging relation of the outer surfaces of the friction post, the friction shoes D will be forced apart. Inasmuch asthc keen wedge faces 28 and 80 will not accommodate this lateral displacement, the fricti n post E and the friction shoe D having the blunt wedge face are displaced laterally, movement of the post E laterally being permitted due to the manner in which it is mounted between the lugs 23 and the abutment surfaces25 of the casin A.

From the preceding description taken in connection with the drawings, it will be evident that due to the friction surfaces of the liners, shoes, wedge oloclrs andpostsbeing of t shaped section, the parts of the friction means are limited to movement in a direction longitudinal of the mechanism and are prevented from drag on the top and bottom walls. of the casing. As hereinbefore pointed out, the cooperating wedge faces of the wedge blocks and friction shoes are plain so that the shoes and wedge blocks may be displaced to a limited ei-Zent vertically with respect to each other without interfering with the proper lace contact between these parts.

In the construction of. the mechanisms of the character herein described, slight inaccuracies often occur in the contour of the friction surfaces and wedge faces which are unavoidable under the usual manufacturing conditions. It will be evident. that when such inaccuracies occur and the cooperating wedge faces of the friction shoes'and wedge bloclrsare also made so as to interfit, a rela tive displacement of the parts might occur whichwould permit proper contact between either the cooperating wetge faces or the By. providing the plain flat wedge surfaces, as hereinbefore pointed out, entire amount of displacement necessary is taken care to ac commodate the parts to inaccuracies due to manufacturing conditions. 7 f.

i fhile l have herein shown and described the preferred manner of carrying out my invention, the same is merely illustrative, and I contemplate all changes and modifications which come within the scope of the claims appended hereto.

1 claim:

,1. In a friction shock absorbing mechanism,the combination with a casing having a pair of lon itudinally disposed in terior friction surfaces; a central. friction post within the casing; friction .relements having friction surfaces cooperating with the friction surfaces of the casing, said elements being slidable lengthwise of the easing; additional friction elements having wedging engagement with the first named mechanism being formed to confine all of said elements to .movement longitudinally or the cas ng only; and spring resistance means 1 opposing relative movement of the casing and, additional elements.

2. In a v friction shock absorbing mechanism, the combinationwith a casing haw ing a friction shell section at the forward end thereof presenting opposed interior friction surfaces; of a central friction post anchored'to the-casing against longitudinal movement with respect thereto; aspring resistance within the casing; a pair of friction shoes disposed on opposite sides of the post having friction surfaces cooperating with the friction surfaces of the post; a pair of wedge pressure transmitting members interposed between the friction shoes and friction surfaces of the shell, said wedge membersand shoes having interengaging wedge faces permitting displacement of the shoes and wedge members both longitudinally and laterally of the mechanism, the friction surfaces of the shoes inferengaging the. friction surfaces of the wedge pressure transmitting members, and the friction surfaces of the friction shoes in tel-engaging the friction surfaces of the post, and limiting movement of the shoes and wedge pressure transmitting members to a direction lengthwise of the casing.

3. In; a friction shock absorbing mechanism, the combination with a friction shell having opposed interior V-shaped friction surfaces; of a central friction postwithin the shell having ii-shaped friction surfacesonthe oppositev sides thereof; a

pair of friction shoes having V-shaped' friction surfaces cooperating with said post friction surfaces; a pair of wedge blocks having :V shaped friction surfaces cooperating-with the ll-shaped friction surfaces of the shell, said wedge blocks andshoes having interengaging plain wedge faces; and

"friction postbeing of interengaging guide and groove formation to limit movement of the shoes. and WQtl G blocks toa direction longitudinal of the mechanismyand spring resistance means yieldingly opposing in- Ward movement of the shoes.

5. In a friction shock absorbing mecha nisin the combination With a friction shell having opposed interior iF-shaped friction surfaces; of a pair of pressure tliLnSDlliF ting Wedge blocks having ii-shaped friction surfaces cooperating with the friction surfaces of the shell; a central friction post having inwardly diverging friction surfaces of i-shapecl section on the" opposite sides thereof; a pair of friction shoes cooperating with the friction surfaces of the post and having thesame formed of V sectiontoin terfit iiith the friction surfaces of the post, friction shoes and Wedge blocks having 1 cooperating Wedge faces permitting relative displacement of the friction shoes and. Wedge blocks to permit alignment of the in terfittting l-shaped friction surfaces ofthe mechanism; and a spring resistance yield ingly v pp'osing inward movement of the shoes. Y

In witnessthat I claim the fore oing I have hereunto subscribed my name this 20th dayfof July, 1927, c

I 'HENRYFUCHS. 

